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31.53 tons is about four-and-a-half times as as a Tyrannosaurus rex.

In other words, the of a Tyrannosaurus rex is 0.22 times that amount.

(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 7.1 tons while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.